Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wirel...

[deliverable/linux.git] / net / mac80211 / mlme.c

diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c
index c686d1b90f9fb8c91b1acd3fd0336ce9f621620f..461167dfa42c1f1e6051c97adf5dccdfffb0b09a 100644 (file)
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -46,6 +46,13 @@
  */
 #define IEEE80211_PROBE_WAIT           (HZ / 2)
 
+/*
+ * Weight given to the latest Beacon frame when calculating average signal
+ * strength for Beacon frames received in the current BSS. This must be
+ * between 1 and 15.
+ */
+#define IEEE80211_SIGNAL_AVE_WEIGHT    3
+
 #define TMR_RUNNING_TIMER      0
 #define TMR_RUNNING_CHANSW     1
 
@@ -203,7 +210,7 @@ static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata,
 
 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
                                           const u8 *bssid, u16 stype, u16 reason,
-                                          void *cookie)
+                                          void *cookie, bool send_frame)
 {
        struct ieee80211_local *local = sdata->local;
        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
@@ -240,7 +247,11 @@ static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
                        cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
        if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
                IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
-       ieee80211_tx_skb(sdata, skb);
+
+       if (send_frame)
+               ieee80211_tx_skb(sdata, skb);
+       else
+               kfree_skb(skb);
 }
 
 void ieee80211_send_pspoll(struct ieee80211_local *local,
@@ -436,10 +447,12 @@ static void ieee80211_enable_ps(struct ieee80211_local *local,
                if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
                        ieee80211_send_nullfunc(local, sdata, 1);
 
-               if (!(local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)) {
-                       conf->flags |= IEEE80211_CONF_PS;
-                       ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
-               }
+               if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
+                   (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
+                       return;
+
+               conf->flags |= IEEE80211_CONF_PS;
+               ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
        }
 }
 
@@ -558,7 +571,8 @@ void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
            (!(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)))
                ieee80211_send_nullfunc(local, sdata, 1);
 
-       if (!(local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) ||
+       if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
+             (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
            (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
                ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
                local->hw.conf.flags |= IEEE80211_CONF_PS;
@@ -732,6 +746,8 @@ static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
        sdata->u.mgd.associated = cbss;
        memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
 
+       sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
+
        /* just to be sure */
        sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
                                IEEE80211_STA_BEACON_POLL);
@@ -773,7 +789,8 @@ static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
        netif_carrier_on(sdata->dev);
 }
 
-static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata)
+static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
+                                  bool remove_sta)
 {
        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
        struct ieee80211_local *local = sdata->local;
@@ -846,7 +863,8 @@ static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata)
        changed |= BSS_CHANGED_BSSID;
        ieee80211_bss_info_change_notify(sdata, changed);
 
-       sta_info_destroy_addr(sdata, bssid);
+       if (remove_sta)
+               sta_info_destroy_addr(sdata, bssid);
 }
 
 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
@@ -959,7 +977,7 @@ static void __ieee80211_connection_loss(struct ieee80211_sub_if_data *sdata)
 
        printk(KERN_DEBUG "Connection to AP %pM lost.\n", bssid);
 
-       ieee80211_set_disassoc(sdata);
+       ieee80211_set_disassoc(sdata, true);
        ieee80211_recalc_idle(local);
        mutex_unlock(&ifmgd->mtx);
        /*
@@ -969,7 +987,7 @@ static void __ieee80211_connection_loss(struct ieee80211_sub_if_data *sdata)
        ieee80211_send_deauth_disassoc(sdata, bssid,
                                       IEEE80211_STYPE_DEAUTH,
                                       WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
-                                      NULL);
+                                      NULL, true);
 }
 
 void ieee80211_beacon_connection_loss_work(struct work_struct *work)
@@ -1025,7 +1043,7 @@ ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
        printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n",
                        sdata->name, bssid, reason_code);
 
-       ieee80211_set_disassoc(sdata);
+       ieee80211_set_disassoc(sdata, true);
        ieee80211_recalc_idle(sdata->local);
 
        return RX_MGMT_CFG80211_DEAUTH;
@@ -1055,7 +1073,7 @@ ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
        printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n",
                        sdata->name, mgmt->sa, reason_code);
 
-       ieee80211_set_disassoc(sdata);
+       ieee80211_set_disassoc(sdata, true);
        ieee80211_recalc_idle(sdata->local);
        return RX_MGMT_CFG80211_DISASSOC;
 }
@@ -1347,6 +1365,7 @@ static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
                                     struct ieee80211_rx_status *rx_status)
 {
        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
+       struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
        size_t baselen;
        struct ieee802_11_elems elems;
        struct ieee80211_local *local = sdata->local;
@@ -1382,6 +1401,41 @@ static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
        if (memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0)
                return;
 
+       /* Track average RSSI from the Beacon frames of the current AP */
+       ifmgd->last_beacon_signal = rx_status->signal;
+       if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
+               ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
+               ifmgd->ave_beacon_signal = rx_status->signal;
+               ifmgd->last_cqm_event_signal = 0;
+       } else {
+               ifmgd->ave_beacon_signal =
+                       (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
+                        (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
+                        ifmgd->ave_beacon_signal) / 16;
+       }
+       if (bss_conf->cqm_rssi_thold &&
+           !(local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI)) {
+               int sig = ifmgd->ave_beacon_signal / 16;
+               int last_event = ifmgd->last_cqm_event_signal;
+               int thold = bss_conf->cqm_rssi_thold;
+               int hyst = bss_conf->cqm_rssi_hyst;
+               if (sig < thold &&
+                   (last_event == 0 || sig < last_event - hyst)) {
+                       ifmgd->last_cqm_event_signal = sig;
+                       ieee80211_cqm_rssi_notify(
+                               &sdata->vif,
+                               NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
+                               GFP_KERNEL);
+               } else if (sig > thold &&
+                          (last_event == 0 || sig > last_event + hyst)) {
+                       ifmgd->last_cqm_event_signal = sig;
+                       ieee80211_cqm_rssi_notify(
+                               &sdata->vif,
+                               NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
+                               GFP_KERNEL);
+               }
+       }
+
        if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
                if (net_ratelimit()) {
@@ -1667,7 +1721,7 @@ static void ieee80211_sta_work(struct work_struct *work)
                        printk(KERN_DEBUG "No probe response from AP %pM"
                                " after %dms, disconnecting.\n",
                                bssid, (1000 * IEEE80211_PROBE_WAIT)/HZ);
-                       ieee80211_set_disassoc(sdata);
+                       ieee80211_set_disassoc(sdata, true);
                        ieee80211_recalc_idle(local);
                        mutex_unlock(&ifmgd->mtx);
                        /*
@@ -1677,7 +1731,7 @@ static void ieee80211_sta_work(struct work_struct *work)
                        ieee80211_send_deauth_disassoc(sdata, bssid,
                                        IEEE80211_STYPE_DEAUTH,
                                        WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
-                                       NULL);
+                                       NULL, true);
                        mutex_lock(&ifmgd->mtx);
                }
        }
@@ -1861,6 +1915,9 @@ int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
        struct ieee80211_work *wk;
        u16 auth_alg;
 
+       if (req->local_state_change)
+               return 0; /* no need to update mac80211 state */
+
        switch (req->auth_type) {
        case NL80211_AUTHTYPE_OPEN_SYSTEM:
                auth_alg = WLAN_AUTH_OPEN;
@@ -1969,7 +2026,7 @@ int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
                }
 
                /* Trying to reassociate - clear previous association state */
-               ieee80211_set_disassoc(sdata);
+               ieee80211_set_disassoc(sdata, true);
        }
        mutex_unlock(&ifmgd->mtx);
 
@@ -2073,7 +2130,7 @@ int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
 
        if (ifmgd->associated == req->bss) {
                bssid = req->bss->bssid;
-               ieee80211_set_disassoc(sdata);
+               ieee80211_set_disassoc(sdata, true);
                mutex_unlock(&ifmgd->mtx);
        } else {
                bool not_auth_yet = false;
@@ -2116,9 +2173,9 @@ int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
        printk(KERN_DEBUG "%s: deauthenticating from %pM by local choice (reason=%d)\n",
               sdata->name, bssid, req->reason_code);
 
-       ieee80211_send_deauth_disassoc(sdata, bssid,
-                       IEEE80211_STYPE_DEAUTH, req->reason_code,
-                       cookie);
+       ieee80211_send_deauth_disassoc(sdata, bssid, IEEE80211_STYPE_DEAUTH,
+                                      req->reason_code, cookie,
+                                      !req->local_state_change);
 
        ieee80211_recalc_idle(sdata->local);
 
@@ -2130,6 +2187,7 @@ int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
                           void *cookie)
 {
        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
+       u8 bssid[ETH_ALEN];
 
        mutex_lock(&ifmgd->mtx);
 
@@ -2147,13 +2205,15 @@ int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
        printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n",
               sdata->name, req->bss->bssid, req->reason_code);
 
-       ieee80211_set_disassoc(sdata);
+       memcpy(bssid, req->bss->bssid, ETH_ALEN);
+       ieee80211_set_disassoc(sdata, false);
 
        mutex_unlock(&ifmgd->mtx);
 
        ieee80211_send_deauth_disassoc(sdata, req->bss->bssid,
                        IEEE80211_STYPE_DISASSOC, req->reason_code,
-                       cookie);
+                       cookie, !req->local_state_change);
+       sta_info_destroy_addr(sdata, bssid);
 
        ieee80211_recalc_idle(sdata->local);